Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf376b6891fa14c…

MALICIOUS

PDF

46.4 KB Created: 2020-11-04 18:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cab04803f55000e54ba5e920f5357518 SHA-1: d2f71dde838f4a1418e14dd25bfb48ba3df40ac3 SHA-256: 7cf376b6891fa14c272a730a74ef3d591ce46de7dc4c2e8a55b83884e418e0b3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=rhea+seehorn+sister In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f88d231d68f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f909ce8caa94.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/f3b87822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5f91fa85aa8d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f8a101e8f52f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f890b9417020.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/b626fe5a22736.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/7061675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f9895caaa042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5701ecb3-42f1-4566-ab19-ba6d5e1cb838/70908597454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2add06-bf1a-43d6-a092-822da4ef5952/balinugol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01aa62a2-e722-4841-b6fb-4d0ad83197bc/jamaica_kincaid_short_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54364189-d137-43e0-9f85-192bea426fd4/dojewazinigalafek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05876208-4da4-476b-b606-87a42a06e725/wonder_full_book.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A93 4536 bytes
SHA-256: 9bf01e4e9afad531632ca52331736ae30469d0ef8c3b24d4b1a7a28307348ed0
font_01_sfnt_off000079e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E9 10784 bytes
SHA-256: 25175576a1d80a200ffca6439ad9c86309cf4cd9b99d33d1f08af8e34d9f7d78
font_02_sfnt_off00009eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EEA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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